CN110707977B - Suppression method and system for voltage oscillation on direct current side - Google Patents
Suppression method and system for voltage oscillation on direct current side Download PDFInfo
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- CN110707977B CN110707977B CN201810745279.4A CN201810745279A CN110707977B CN 110707977 B CN110707977 B CN 110707977B CN 201810745279 A CN201810745279 A CN 201810745279A CN 110707977 B CN110707977 B CN 110707977B
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/05—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for damping motor oscillations, e.g. for reducing hunting
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Abstract
The invention discloses a method and a system for inhibiting voltage oscillation on a direct current side, which are applied to an urban rail vehicle comprising a linear motor traction system and comprise the following steps: determining the voltage oscillation quantity of the direct-current side voltage of the inverter; converting the voltage oscillation quantity into a slip frequency compensation quantity, and compensating the slip frequency compensation quantity on a given slip frequency of the linear motor; obtaining the stator frequency of the linear motor according to the compensated given slip frequency and the rotor frequency of the linear motor, and re-determining the coordinate conversion angle value in the synchronous rotation coordinate conversion formula of the vector control system according to the stator frequency; the output of the inverter is adjusted to suppress the amount of oscillation using the re-determined vector control system. The method and the device compensate the given slip frequency, readjust the output of the inverter and enable the linear motor to consume the oscillating voltage on the direct current side of the inverter, so that the torque pulsation of the linear motor is not easy to cause, overvoltage and overcurrent fault protection of a traction system is not easy to trigger, and the stability and the driving safety of the traction system are improved.
Description
Technical Field
The invention relates to the technical field of oscillation suppression, in particular to a method and a system for suppressing direct-current side voltage oscillation.
Background
At present, the linear motor traction system has the advantages of strong climbing capability, small turning radius, low manufacturing cost and the like, and is widely applied to urban rail vehicles. Referring to fig. 1, fig. 1 is a schematic view illustrating a vector control of a linear motor traction system in the prior art. In the prior art, a linear motor traction system is powered by a direct current power supply filtered by an LC filter circuit, and then inverted by an inverter to output three-phase alternating current to three-phase symmetrical windings a, b, and c in the linear motor, wherein the stability of the three-phase alternating current is controlled based on a vector control system.
The specific control process of the vector control system comprises: 1) three-phase alternating current i input by linear motora、ib、icAnd will ia、ib、icAccording to the principle of magnetomotive force equality, the two-phase alternating current i input by the mutually vertical two-phase windings alpha and beta is equivalentα、iβNamely, the three-phase coordinate system is transformed into a two-phase coordinate system; 2) will iα、iβAccording to the formula i of synchronous rotation coordinate transformationd＝iαcosθ+iβsin theta and iq＝iβcosθ-iαsin theta into two direct currents id、iqConverting the two-phase stationary coordinate system into a two-phase rotating coordinate system, wherein theta is a coordinate conversion angle value; 3) setting the given current value of the linear motor
(given magnetomotive force FeGiven the calculation by vector control) and id、iqCorrespondingly making a difference, and correspondingly adjusting the output modulation amount U by two PI (proportional-integral) controllers according to the two difference valuessd、Usq(ii) a 4) Will Usd、UsqTransforming two-phase rotating coordinate system into two-phase static coordinate system to obtain Usα、UsβAnd will Usα、UsβAfter being modulated by SVPWM (Space Vector Pulse Width Modulation), the switching-on state of a switch in the inverter is controlled, so that the inverter can adjust the output three-phase alternating current conveniently.
However, the existence of the LC filter circuit easily causes the direct-current side voltage oscillation of the inverter, and further causes the torque ripple of the linear motor, so that the overvoltage and overcurrent fault protection of the traction system is easily triggered, and the driving safety is affected. However, the conventional vector control system only controls the output of the inverter to be stable, and cannot consume the voltage oscillated on the dc side, and further cannot suppress the oscillation of the voltage on the dc side.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a method and a system for inhibiting voltage oscillation on a direct current side, which enable a linear motor to consume the voltage of the direct current side oscillation of an inverter and play a role in inhibiting the voltage oscillation on the direct current side, thereby not easily causing the torque pulsation of the linear motor, further not easily triggering overvoltage and overcurrent fault protection of a traction system, and improving the stability of the traction system and the driving safety.
In order to solve the technical problem, the invention provides a method for suppressing voltage oscillation on a direct current side, which is applied to an urban rail vehicle comprising a linear motor traction system and comprises the following steps:
determining the voltage oscillation quantity of the direct-current side voltage of the inverter;
converting the voltage oscillation quantity into a slip frequency compensation quantity, and compensating the slip frequency compensation quantity on a given slip frequency of the linear motor;
obtaining the stator frequency of the linear motor according to the compensated given slip frequency and the rotor frequency of the linear motor, and re-determining the coordinate conversion angle value in the synchronous rotation coordinate conversion formula of the vector control system according to the stator frequency;
adjusting an output of the inverter with the re-determined vector control system to suppress the oscillation amount.
Preferably, the process of determining the voltage oscillation amount of the dc side voltage of the inverter specifically includes:
filtering the direct current side voltage of the inverter to obtain direct current filtering voltage;
and subtracting the direct current side voltage from the direct current filtering voltage to obtain a voltage oscillation quantity.
Preferably, the process of performing filtering processing on the dc side voltage of the inverter specifically includes:
and filtering the direct current side voltage of the inverter by adopting a low-pass filter.
Preferably, the low-pass filter is in particular a butterworth filter.
Preferably, the process of converting the voltage oscillation quantity into the slip frequency compensation quantity specifically includes:
converting the voltage oscillation quantity into a slip frequency compensation quantity according to a preset conversion formula delta omega-delta U-K, wherein delta omega is the slip frequency compensation quantity, delta U is the voltage oscillation quantity, K is a preset oscillation suppression coefficient, and when the linear motor is pulled, K is larger than 0; when the linear motor is braked, K is less than 0.
In order to solve the above technical problem, the present invention further provides a dc side voltage oscillation suppression system, including:
the oscillation determining module is used for determining the voltage oscillation quantity of the direct-current side voltage of the inverter;
the slip compensation module is used for converting the voltage oscillation quantity into a slip frequency compensation quantity and compensating the slip frequency compensation quantity on a given slip frequency of the linear motor;
the angle determining module is used for solving the stator frequency of the linear motor according to the compensated given slip frequency and the rotor frequency of the linear motor and re-determining the coordinate conversion angle value in the synchronous rotation coordinate conversion formula of the vector control system according to the stator frequency;
and an oscillation suppression module for adjusting an output of the inverter using the re-determined vector control system to suppress the amount of oscillation.
Preferably, the oscillation determination module comprises:
the filtering processing unit is used for filtering the direct current side voltage of the inverter to obtain direct current filtering voltage;
and the oscillation obtaining unit is used for subtracting the direct current side voltage from the direct current filtering voltage to obtain a voltage oscillation quantity.
Preferably, the filter processing unit is specifically a low-pass filter.
Preferably, the slip compensation module is specifically configured to convert the voltage oscillation amount into a slip frequency compensation amount according to a preset conversion formula Δ ω ═ Δ U × K, where Δ ω is the slip frequency compensation amount, Δ U is the voltage oscillation amount, and K is a preset oscillation suppression coefficient, and when the linear motor is in traction, K is greater than 0; when the linear motor is braked, K is less than 0.
The invention provides a method for inhibiting voltage oscillation on a direct current side, which is applied to an urban rail vehicle comprising a linear motor traction system and comprises the following steps: determining the voltage oscillation quantity of the direct-current side voltage of the inverter; converting the voltage oscillation quantity into a slip frequency compensation quantity, and compensating the slip frequency compensation quantity on a given slip frequency of the linear motor; obtaining the stator frequency of the linear motor according to the compensated given slip frequency and the rotor frequency of the linear motor, and re-determining the coordinate conversion angle value in the synchronous rotation coordinate conversion formula of the vector control system according to the stator frequency; the output of the inverter is adjusted to suppress the amount of oscillation using the re-determined vector control system.
The method and the device combine the slip frequency of the linear motor to quickly respond to the torque of the linear motor, compensate the given slip frequency, re-determine the vector control system according to the compensated given slip frequency, adjust the output of the inverter by using the re-determined vector control system, further adjust the torque of the linear motor, enable the linear motor to consume the voltage oscillating on the direct current side of the inverter, and play a role in restraining the voltage oscillation on the direct current side, thereby not easily causing the torque pulsation of the linear motor, further not easily triggering the overvoltage and overcurrent fault protection of the traction system, and improving the stability of the traction system and the driving safety.
The invention also provides a suppression system of the voltage oscillation on the direct current side, and the suppression system has the same beneficial effects as the suppression method.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of a prior art vector control for a linear motor traction system;
fig. 2 is a flowchart of a method for suppressing dc side voltage oscillation according to the present invention;
FIG. 3 is a schematic diagram illustrating suppression of DC side voltage oscillations in a linear motor traction system according to the present invention;
fig. 4 is a schematic structural diagram of a dc side voltage oscillation suppression system according to the present invention.
Detailed Description
The core of the invention is to provide a method and a system for inhibiting the voltage oscillation at the direct current side, so that the linear motor consumes the voltage oscillating at the direct current side of the inverter, and the effect of inhibiting the voltage oscillation at the direct current side is achieved, thereby the torque pulsation of the linear motor is not easy to be caused, the overvoltage and overcurrent fault protection of a traction system is not easy to be triggered, and the stability and the driving safety of the traction system are improved.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, fig. 2 is a flowchart of a method for suppressing dc side voltage oscillation according to the present invention.
The suppression method is applied to an urban rail vehicle comprising a linear motor traction system, and comprises the following steps:
step S1: determining the voltage oscillation quantity of the direct-current side voltage of the inverter;
it should be noted that the preset in the present application is set in advance, and only needs to be set once, and the preset does not need to be reset unless modified according to actual conditions.
Specifically, first, referring to fig. 1, a control process of a vector control system of a linear motor traction system is described in detail:
1) it is known that three-phase symmetrical stationary windings a, b, c in linear motors are supplied with three-phase-balanced alternating currents ia、ib、icThen, a resultant magnetomotive force F is generated. The principle of the multi-phase motor model equivalence is as follows: the magnetomotive force generated under different coordinate systems is completely consistent. Considering the simplest two-phase motor model, two-phase balanced alternating currents i are applied to the two-phase stationary windings alpha and beta which are perpendicular to each otherα、iβAnd generating a synthesized electromotive force F, namely, enabling the three-phase motor model to be equivalent to a two-phase motor model, namely, converting a three-phase coordinate system into a two-phase coordinate system.
Therefore, firstly, the three-phase alternating current i introduced into the linear motor is collecteda、ib、icAnd will ia、ib、icConversion from a three-phase coordinate system to a two-phase alternating current i in a two-phase coordinate systemα、iβ。
2) It is known to pass a two-phase alternating current iα、iβAnd two direct currents i are introducedd、iqIf the two-phase motor rotates at the synchronous rotating speed to generate equal synthetic magnetomotive force F, the transformation from the two-phase stationary coordinate system to the two-phase rotating coordinate system is realized. Wherein, the synchronous rotation coordinate transformation formula is as follows: i.e. id＝iαcosθ+iβsin theta and iq＝iβcosθ-iαsin θ, θ is a coordinate conversion angle value. Specifically, idThe excitation coil is introduced into the two-phase motor and is used for generating an electromagnetic field called as excitation current; i.e. iqThe rotor of a two-phase motor is energized to rotate under the influence of an electromagnetic field and to pull a load, referred to as a torque current.
Therefore, the two-phase AC current iα、iβConverting into exciting current i according to synchronous rotation coordinate conversion formuladAnd torque current iq。
3) Setting exciting current of linear motor
And given torque current
And id、iqCorrespondingly making difference, and correspondingly regulating output modulation U by two PI controllerssd、Usq。
4) Modulating quantity Usd、UsqTransforming two-phase rotating coordinate system into two-phase static coordinate system to obtain Usα、UsβAnd will Usα、UsβAfter SVPWM modulation, the on-state of a switch in the inverter is controlled, so that the inverter can adjust the output three-phase alternating current to complete a vector control system of the linear motor traction system.
Considering that the direct-current side voltage of the inverter is easy to oscillate, and the existing vector control system does not adjust the oscillating direct-current side voltage, the voltage oscillation amount of the direct-current side voltage is determined by analyzing the oscillating direct-current side voltage, and a foundation is laid for subsequent suppression of oscillation of the direct-current side voltage.
Step S2: converting the voltage oscillation quantity into a slip frequency compensation quantity, and compensating the slip frequency compensation quantity on a given slip frequency of the linear motor;
specifically, the power can be adjusted by changing the torque of the linear motor, and if the torque of the linear motor is increased, the voltage oscillating on the direct current side can be consumed, and the torque of the linear motor is controlled by the torque current; the present application also considers the electrical characteristics of the linear motor: the influence of the slip frequency of the linear motor on the torque characteristic is sensitive; therefore, the present application converts the voltage oscillation amount into the slip frequency compensation amount and compensates at the given slip frequency of the linear motor, that is, the current slip frequency is equal to the given slip frequency + the slip frequency compensation amount.
Step S3: obtaining the stator frequency of the linear motor according to the compensated given slip frequency and the rotor frequency of the linear motor, and re-determining the coordinate conversion angle value in the synchronous rotation coordinate conversion formula of the vector control system according to the stator frequency;
specifically, it is known that the slip frequency is equal to the stator frequency-rotor frequency of the linear motor, so that the current stator frequency of the linear motor is equal to the current slip frequency + rotor frequency, and the rotor frequency of the linear motor is calculated from the rotation speed thereof. And then, integrating the current stator frequency of the linear motor to obtain an angle value, and using the obtained angle value as a coordinate conversion angle value in a synchronous rotation coordinate conversion formula of the vector control system, thereby updating the vector control system.
Step S4: the output of the inverter is adjusted to suppress the amount of oscillation using the re-determined vector control system.
Specifically, after the vector control system is updated, the output of the inverter changes correspondingly, so that the torque of the linear motor is rapidly adjusted, the linear motor consumes the voltage oscillating on the direct current side of the inverter, and the effect of inhibiting the voltage oscillation on the direct current side is achieved. In essence, through compensation of the slip frequency of the linear motor, the change of the torque characteristic is reflected, and the vector control system is a concrete implementation link in which the slip frequency influences the torque, so that the torque pulsation of the linear motor is not easy to cause, overvoltage and overcurrent fault protection of a traction system is not easy to trigger, and the stability and the driving safety of the traction system are improved.
The invention provides a method for inhibiting voltage oscillation on a direct current side, which is applied to an urban rail vehicle comprising a linear motor traction system and comprises the following steps: determining the voltage oscillation quantity of the direct-current side voltage of the inverter; converting the voltage oscillation quantity into a slip frequency compensation quantity, and compensating the slip frequency compensation quantity on a given slip frequency of the linear motor; obtaining the stator frequency of the linear motor according to the compensated given slip frequency and the rotor frequency of the linear motor, and re-determining the coordinate conversion angle value in the synchronous rotation coordinate conversion formula of the vector control system according to the stator frequency; the output of the inverter is adjusted to suppress the amount of oscillation using the re-determined vector control system.
The method and the device combine the slip frequency of the linear motor to quickly respond to the torque of the linear motor, compensate the given slip frequency, re-determine the vector control system according to the compensated given slip frequency, adjust the output of the inverter by using the re-determined vector control system, further adjust the torque of the linear motor, enable the linear motor to consume the voltage oscillating on the direct current side of the inverter, and play a role in restraining the voltage oscillation on the direct current side, thereby not easily causing the torque pulsation of the linear motor, further not easily triggering the overvoltage and overcurrent fault protection of the traction system, and improving the stability of the traction system and the driving safety.
On the basis of the above-described embodiment:
as a preferred embodiment, the process of determining the voltage oscillation amount of the dc-side voltage of the inverter is specifically as follows:
filtering the direct current side voltage of the inverter to obtain direct current filtering voltage;
and (4) subtracting the direct current side voltage from the direct current filter voltage to obtain the voltage oscillation quantity.
Further, the process of obtaining the voltage oscillation amount in the present application specifically includes: 1) filtering the direct current side voltage of the inverter, and filtering the voltage oscillation quantity of the direct current side voltage to obtain direct current filtering voltage; 2) and (3) making a difference between the direct current side voltage of the inverter and the direct current filter voltage, namely making a difference between the direct current side voltage with the voltage oscillation quantity and the direct current side voltage with the voltage oscillation quantity filtered out, so as to obtain the voltage oscillation quantity.
As a preferred embodiment, the process of performing the filtering process on the dc-side voltage of the inverter specifically includes:
and filtering the direct current side voltage of the inverter by adopting a low-pass filter.
Further, the present application may employ a low-pass filter, which is an electronic filter device that allows a signal lower than a cutoff frequency to pass therethrough but does not allow a signal higher than the cutoff frequency to pass therethrough, to perform filtering processing on the dc side voltage of the inverter. The present application may also use other filtering devices or filtering circuits to filter the dc-side voltage of the inverter, and the present application is not limited thereto.
As a preferred embodiment, the low-pass filter is in particular a butterworth filter.
In particular, the low-pass filter in the present application may be a butterworth filter, which has a stable amplitude-frequency characteristic both inside and outside the passband. The specific choice of the low-pass filter is not particularly limited in this application.
As a preferred embodiment, the process of converting the voltage oscillation amount into the slip frequency compensation amount is specifically as follows:
converting the voltage oscillation quantity into a slip frequency compensation quantity according to a preset conversion formula delta omega ═ delta U × (K), wherein the delta omega is the slip frequency compensation quantity, the delta U is the voltage oscillation quantity, the K is a preset oscillation suppression coefficient, and when the linear motor is pulled, the K is larger than 0; when the linear motor is braked, K is less than 0.
Further, the conversion process from the voltage oscillation quantity to the slip frequency compensation quantity in the present application specifically includes: and according to the set conversion formula delta omega-delta U-K, converting the voltage oscillation quantity to the slip frequency compensation quantity, namely multiplying the voltage oscillation quantity delta U by the set oscillation suppression coefficient K to obtain the slip frequency compensation quantity delta omega. When the linear motor is used for traction, K is more than 0; when the linear motor is braked, K is less than 0. As for the specific value of K, it is set according to practical conditions.
In addition, referring to fig. 3, fig. 3 is a schematic diagram illustrating suppression of dc side voltage oscillation of a linear motor traction system according to the present invention, and fig. 3 shows the above proposed suppression strategy of dc side voltage oscillation, wherein UdIs the voltage of the direct current side,
is a voltage of the direct current filter, and the direct current filter is connected with the direct current filter,
for a given slip frequency, ω1Is the stator frequency, ωnIs the rotor frequency and v is the rotational speed.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a dc side voltage oscillation suppression system according to the present invention.
The suppression system includes:
the oscillation determining module 1 is used for determining the voltage oscillation quantity of the DC side voltage of the inverter;
the slip compensation module 2 is used for converting the voltage oscillation quantity into a slip frequency compensation quantity and compensating the slip frequency compensation quantity on the given slip frequency of the linear motor;
the angle determining module 3 is used for solving the stator frequency of the linear motor according to the compensated given slip frequency and the rotor frequency of the linear motor, and re-determining the coordinate conversion angle value in the synchronous rotation coordinate conversion formula of the vector control system according to the stator frequency;
and the oscillation suppression module 4 is used for adjusting the output of the inverter by using the re-determined vector control system so as to suppress the oscillation quantity.
As a preferred embodiment, the oscillation determining module 1 comprises:
the filtering processing unit is used for filtering the direct current side voltage of the inverter to obtain direct current filtering voltage;
and the oscillation obtaining unit is used for subtracting the direct current side voltage from the direct current filter voltage to obtain the voltage oscillation quantity.
As a preferred embodiment, the filter processing unit is embodied as a low-pass filter.
As a preferred embodiment, the slip compensation module 2 is specifically configured to convert the voltage oscillation amount into a slip frequency compensation amount according to a preset conversion formula Δ ω ═ Δ U × K, where Δ ω is the slip frequency compensation amount, Δ U is the voltage oscillation amount, and K is a preset oscillation suppression coefficient, and when the linear motor is in traction, K is greater than 0; when the linear motor is braked, K is less than 0.
For introduction of the suppression system provided in the present application, please refer to the above-mentioned suppression method embodiment, which is not described herein again.
It should also be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A method for suppressing voltage oscillation on a direct current side is characterized by being applied to an urban rail vehicle comprising a linear motor traction system and comprising the following steps:
determining the voltage oscillation quantity of the direct-current side voltage of the inverter;
converting the voltage oscillation quantity into a slip frequency compensation quantity, and compensating the slip frequency compensation quantity on a given slip frequency of the linear motor;
obtaining the stator frequency of the linear motor according to the compensated given slip frequency and the rotor frequency of the linear motor, and re-determining the coordinate conversion angle value in the synchronous rotation coordinate conversion formula of the vector control system according to the stator frequency;
adjusting an output of the inverter with the re-determined vector control system to suppress the oscillation amount;
the process of converting the voltage oscillation quantity into the slip frequency compensation quantity specifically comprises the following steps:
converting the voltage oscillation quantity into a slip frequency compensation quantity according to a preset conversion formula, wherein the voltage oscillation quantity is converted into the slip frequency compensation quantity, the voltage oscillation quantity is converted into the slip frequency compensation quantity according to a preset conversion formula, the voltage oscillation quantity is converted into the voltage oscillation quantity according to the preset conversion formula, and the voltage oscillation quantity is converted into the voltage oscillation quantity according to the preset conversion formula; when the linear motor is braked, K is less than 0.
2. The method for suppressing voltage oscillation on the dc side according to claim 1, wherein the step of determining the voltage oscillation amount of the dc side voltage of the inverter is specifically:
filtering the direct current side voltage of the inverter to obtain direct current filtering voltage;
and subtracting the direct current side voltage from the direct current filtering voltage to obtain a voltage oscillation quantity.
3. The method for suppressing voltage oscillation on the dc side according to claim 2, wherein the step of performing filtering processing on the dc side voltage of the inverter specifically comprises:
and filtering the direct current side voltage of the inverter by adopting a low-pass filter.
4. Method for suppressing voltage oscillations on the DC-side according to claim 3, characterized in that said low-pass filter is in particular a Butterworth filter.
5. A system for suppressing dc side voltage oscillations, comprising:
the oscillation determining module is used for determining the voltage oscillation quantity of the direct-current side voltage of the inverter;
the slip compensation module is used for converting the voltage oscillation quantity into a slip frequency compensation quantity and compensating the slip frequency compensation quantity on a given slip frequency of the linear motor;
the angle determining module is used for solving the stator frequency of the linear motor according to the compensated given slip frequency and the rotor frequency of the linear motor and re-determining the coordinate conversion angle value in the synchronous rotation coordinate conversion formula of the vector control system according to the stator frequency;
a ringing suppression module for adjusting an output of the inverter with the re-determined vector control system to suppress the amount of ringing;
the slip compensation module is specifically configured to convert the voltage oscillation quantity into a slip frequency compensation quantity according to a preset conversion formula Δ ω ═ Δ U × K, where Δ ω is the slip frequency compensation quantity, Δ U is the voltage oscillation quantity, K is a preset oscillation suppression coefficient, and when the linear motor is pulled, K is greater than 0; when the linear motor is braked, K is less than 0.
6. The system for suppressing dc-side voltage oscillations according to claim 5, characterized in that said oscillation determining module comprises:
the filtering processing unit is used for filtering the direct current side voltage of the inverter to obtain direct current filtering voltage;
and the oscillation obtaining unit is used for subtracting the direct current side voltage from the direct current filtering voltage to obtain a voltage oscillation quantity.
7. The system for suppressing dc-side voltage oscillations according to claim 6, characterized in that, said filtering processing unit is embodied as a low-pass filter.
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